In 1845, Ireland experienced a heavy fog and more frequent rains than usual. Farmers were shocked and then horrified when they went to their fields to reap the potato harvest. The tubers were rotten on the vine, and the smell of decay filled the air and hovered over the fields. A major subsistence crop at the time, the loss of this staple and the subsequent famine, known as the Great Hunger, proved devastating to the people, economy, and history of Ireland.1. Potatoes Were Essential to the Irish PopulacePotatoes remain a dietary staple in many parts of the world today. Source: Agricultural Research Service, USDA via Wikimedia CommonsThe importance of potatoes to the Irish people in the mid-19th century can not be overstated. English invasions during the 16th and 17th centuries forced thousands of Irish from their land. Many relocated to western Ireland, where the soil was unsuitable for many crops. English immigrants were enticed to relocate and begin farming in the now-available lands of fertile northern Ireland. The English landlords often rented these estates to the Irish, who used this land to grow more valuable crops, such as wheat and corn, that could be used to pay rent. This led to an increased dependence on potatoes, which could be grown in poorer soil and took up little space. An acre of potato plants could produce food for a typical family for a year. At the time of the famine, about two-thirds of Irish farmers produced only potatoes for their families.2. The Famine Was Initiated by a Fungus-Like OrganismPhytophthora infestans infects the tubers and plants alike. Source: I.Sek, senior via Wikimedia CommonsThe cause of the potato rot and subsequent loss of the crop was a fungus-like organism. Phytophthora infestans, also known as potato blight or late blight, is more common in warm, wet conditions. An organism similar to a fungus called an oomycete, the disease affects the foliage and the potatoes themselves. Leaves rot and shrivel as they turn brown. Some white growth may be observed on the bottom of the leaves. Tubers get reddish-brown spots that soon turn soft and rot. Infected potatoes may not show infection at harvest, but they may rot later while in storage.This disease also affects tomatoes and occasionally related ornamentals such as petunias. It was first recorded in the United States in 1843, and it reached Belgium via a shipment of infected, yet visually normal, tubers. It spread through Europe from there and was first reported in Ireland at the Dublin Botanical Gardens in August 1845. While a year of harvest loss would have been significant, the infection continued, affecting subsequent harvests and exacerbating the effects. Since potatoes are propagated from the tubers themselves, less seed was available, further shrinking potential future crops.3. The Disease Wasnt the Only Contributing FactorAn 1849 sketch representing famine sufferer Bridget ODonnel and two of her children. Source: Illustrated London News via Wikimedia CommonsWhile the disease may have been the inciting factor for the start of the Great Hunger, it was far from the only factor at play. The ongoing tension between Ireland and England created a monoculture subsistence-farming situation that many Irish relied on. Not only was Ireland focused on one crop for subsistence, but generally, one specific variety of potato, the Lumper, was grown. A lack of crop diversity meant that the entire crop throughout the country was susceptible to disease. Relief efforts by other countries, particularly England, fell short and have been blamed for perpetuating the famine. Ongoing wet weather created the ideal conditions for the disease to prosper and spread.4. Food Exports Continued Despite StarvationBarley was one of Irelands money crops that had the potential to feed the masses. Source: Colin Smith / Geograph Britain and Ireland via Wikimedia CommonsDuring the Great Hunger, up to 75 percent of Irelands agricultural soil was dedicated to producing money crops like wheat and oats. These crops were exported largely to England. Despite the fact that these crops had the potential to feed thousands and were unaffected by the blight, exports to England continued throughout the course of the famine. This food was often shipped under military guard as people starved. These exports greatly contributed to the ongoing historical bitterness between Ireland and England.5. Famine Fever Was RampantA Typhoid sufferer. Source: Welcome Images via Wikimedia CommonsExacerbating the effects of spreading starvation, disease was soon moving like wildfire throughout the country. Known collectively as famine fever, illnesses such as cholera, typhoid, dysentery, scurvy, and typhus were common, along with pests such as lice. Many people were forced to abandon their homesteads in search of work, and personal hygiene was not a priority in a time of survival. This led to the easy spread of disease.Starvation causes broad immunodeficiency, leaving even the healthiest susceptible to rapidly moving infections. Digestive diseases were common as people turned to foods they didnt normally consume in order to stay alive, including wild plants and, at times, spoiled food. It is believed that infections accounted for about 50 percent of famine deaths.6. Millions Died, Were Displaced, or Emigrated ElsewhereEmigrants Leaving Ireland by Henry Edward Doyle. Source: An Illustrated History of Ireland from AD 400 to 1800, by Mary Frances Cusack via Wikimedia CommonsAn accurate count of famine victims is impossible to know. However, it is estimated that approximately 12 percent of Irelands population perishedaround one million souls. Others were forced to leave home to look for work or sustenance, with many going so far as to leave the country entirely. Between 1845 and 1855, millions left Ireland in search of survival. About two million went to America and Australia, and approximately 750,000 to other areas of Britain. The exodus of the Irish people was the largest single population movement of the 19th century.A map illustrating the Irish Diaspora. Source: Allice Hunter via Wikimedia CommonsThe Irish Diaspora resulted in changes that rippled through the history of several countries, including the United States. The Irish who arrived during the Great Hunger period played an influential role in US history, including impacts on the building of the Transcontinental Railroad, the development of major cities, and the early labor union movement. Roughly 15 percent of todays US citizenry can claim Irish ancestry.A famine memorial in Dublin. Source: William Murphy via Wikimedia CommonsUnfortunately, many were waiting to be transported to their destinations on coffin ships. These overcrowded, largely unsanitary ships had captains who simply sought to make a profit. Mortality on these boats ranged from 5 to 30 percent, often from disease caused by poor conditions.7. It Led to One of the Earliest International Fundraising EffortsA memorial to the Great Hunger in Cambridge, Massachusetts, USA. Source: Mincebert via Wikimedia CommonsDespite Britains lackluster response, other entities from around the globe came together to attempt to alleviate some of Irelands suffering. These efforts are often considered one of the earliest international responses to a natural disaster. Fundraising started as early as 1845 and picked up in subsequent years.The city of Calcutta in India sent over 16,500 pounds of relief funds, while Bombay sent 3,000. The Society of Friends, better known as the Quakers, in the United States, collected supplies, including clothes, food, seed, and bedding to send, giving over 200,000 pounds worth of relief to the Irish people. The Choctaw people of the United States, who had suffered their own torment on the Trail of Tears just a few years earlier, sent a cash donation (equaling about $5,000 in todays funds). This initiated a lifelong friendship between the town of Midleton, where the funds ended up, and the Choctaw Nation. In 2017, a sculpture commemorating the Choctaws gift was dedicated in a Midleton park.8. Irelands Population Has Never RecoveredIreland via satellite, 2023. Source: Jacques Descloitres, NASA via Wikimedia CommonsAs the Great Hunger caused unprecedented death and displacement, it took a toll on Irelands human population. Pre-famine population levels were rising, quadrupling between 1700 and 1845. As the famine began, Irelands estimated population was over eight million people. By 1851, the Irish population, which had been predicted to be nine million by that time, was reduced to approximately six million. As the famine wound down, the population of the country continued to decline and would remain declining for more than a century, finally ceasing in 1951. Political and economic instability led to continuing emigration long after the famine was considered over.A 2011 crowd in Moneygall, Ireland, watching for visiting US President Barack Obama. Source: White House via Wikimedia Commons2022 census data showed the first population levels over five million since 1851, a 7.6 percent increase from the last data in 2016. In addition, these increases were reflected across all of the countrys counties. As of 2023, Irelands population has still not recovered to pre-famine levels, hovering at 5.2 million people.