
The land that became Allentown was the ancestral territory of the Lenape (Delaware) people for thousands of years before European colonization. The Lenape were a sophisticated Indigenous nation with a complex system of governance, trade, and diplomacy across the Delaware River watershed. The first European intrusion came through the Dutch and Swedish colonial settlements in the early 1600s, which brought epidemic diseases that devastated Lenape communities. European settlers engaged in a pattern of fraudulent land purchases and coercive treaties that systematically dispossessed the Lenape of their lands. The infamous Walking Purchase of 1737, in which the Penn family fraudulently obtained over 1.2 million acres of Lenape land through a rigged foot race, directly affected the Allentown region. This fraudulent land grab forced the Lenape westward into the Ohio Valley, creating deep resentment that led to their alliance with the French during the French and Indian War. The Lenape experience in the Allentown region is a story of dispossession, forced migration, and cultural destruction at the hands of European colonists.
During the French and Indian War, the Allentown region was a dangerous frontier of conflict between British colonists and French-allied Indigenous forces. The Lenape, who had been dispossessed by the Walking Purchase, allied with the French and conducted raids against British settlements throughout the Lehigh Valley. In 1755, following General Braddock's defeat, the Pennsylvania frontier was largely undefended, and Indigenous raiding parties attacked settlements, killing and capturing colonists. The Gnadenhütten massacre of 1755, though on the Mahoning Creek, demonstrated the vulnerability of the region. The British response included the construction of a network of forts and blockhouses across the Lehigh Valley, including Fort Allen near present-day Lehighton, to protect settlers. The war ended with the British victory in 1763, but the frontier remained unsettled, and violence between settlers and Indigenous peoples continued in the Pontiac's War that followed.
Allentown played a significant role in the American Revolution as a center of Patriot activity and a refuge for the Continental Army. The city was founded in 1762 by William Allen, a wealthy Philadelphia merchant and Loyalist, but its population largely supported the Patriot cause. The Liberty Bell was hidden in Allentown (specifically in the Zion Reformed Church) from September 1777 to June 1778, when the British occupied Philadelphia. This act of hiding the iconic symbol of American independence was a powerful statement of resistance. Allentown served as a supply depot and hospital center for the Continental Army, with local farms providing food and the Allentown area serving as a staging ground for military operations. The city also was a site of prisoner exchanges and military musters. The war divided the community, with both Patriots and Loyalists suffering from guerrilla violence, property confiscation, and the disruption of normal life. The Revolution transformed Allentown from a small frontier settlement into an important Pennsylvania community.
During the Civil War, Allentown was a key industrial and transportation hub for the Union war effort. The Lehigh Valley's iron industry, centered in Allentown and nearby Bethlehem, produced essential iron and steel for the Union Army, including cannons, railroad tracks, and armor plating for warships. The Allentown Iron Works and other local foundries operated at full capacity throughout the war. The city was a major recruiting center for the Union Army, and thousands of men from the Lehigh Valley enlisted in Pennsylvania regiments. The 153rd Pennsylvania Infantry Regiment, known as the "Allentown Regiment," was raised primarily from the area and fought in major battles including Fredericksburg and Chancellorsville. The city also hosted training camps for new recruits. The war brought economic prosperity to Allentown, as demand for its industrial products skyrocketed. However, the war also brought grief, as hundreds of local families lost sons and fathers to the conflict. The post-war period saw rapid industrial expansion in Allentown as the city's iron industry transitioned to meet the demands of the industrializing nation.
The 20th century brought new forms of conflict to Allentown. The city's industrial workers, many of them immigrants from Eastern and Southern Europe, engaged in bitter labor struggles for better wages and working conditions. The 1919 Bethlehem Steel strike, which affected Allentown's industrial sector, was part of a nationwide wave of labor militancy that saw workers demanding union recognition and an end to 12-hour workdays. The Great Depression brought economic devastation to Allentown, with unemployment reaching 40% and widespread suffering. During World War II, Allentown's industries converted to military production, producing tanks, munitions, and other war materials. The postwar deindustrialization of the late 20th century devastated Allentown's economy, as Bethlehem Steel and other major employers closed their plants, throwing thousands out of work and destroying the city's industrial base. The opioid crisis of the 21st century, fueled by corporate profiteering by pharmaceutical companies like Purdue Pharma (which had ties to the Sackler family with connections to the region), has been a slow-motion disaster for Allentown's working class, claiming hundreds of lives. The history of Allentown in the 20th and 21st centuries is a history of economic warfare against the working class.