Manifest Destiny and the Pull of the West

A Belief, Not a Description

In the summer of 1845 a New York editor named John O’Sullivan coined the phrase Manifest Destiny. Writing in defence of the annexation of Texas, he claimed it was “the fulfilment of our manifest destiny to overspread the continent allotted by Providence for the free development of our yearly multiplying millions.” The Edexcel specification deliberately calls this a belief rather than a concept — because it was the belief that pushed people onto the wagon trails, not the academic phrase.

Manifest Destiny pulled together three strands of nineteenth-century American thinking: a Protestant idea that the United States had a divine mission, an early racial doctrine of Anglo-Saxonism that imagined English-speaking Protestants as natural leaders of the continent, and a republican confidence that representative government should spread. It was, importantly, an idea about the right to expand — not a description of an empty land. The Plains were already home to hundreds of thousands of people in dozens of Indigenous nations, and Manifest Destiny’s real political work was to legitimise pushing them aside.

Push and Pull: Why Migrants Went

Manifest Destiny was a story migrants told themselves; the reasons they actually packed up and went were more practical. The 1837 financial Panic ruined banks and farms across the East. Generations of cotton and tobacco growing had exhausted soils in the older states. Eastern cities were crowded, factory work was punishing, and religious minorities such as the Mormons faced violent persecution. These were the push factors.

The pull factors were just as strong. Cheap or free farmland in Oregon and California; reports of fertile valleys; access to the Pacific trade with Asia; freedom of worship in places where no establishment church could chase you; and, by 1848, gold. Newspapers, guidebooks and government promotion all amplified the message. Together, push and pull turned a slow trickle of trappers and missionaries in the 1830s into a great westward migration in the 1840s.

The Oregon Trail from 1836

The route west that opened first ran 2,000 miles from Independence, Missouri across the prairies, through the Rocky Mountains at South Pass, down the Snake River and on to the Willamette Valley in Oregon. The Oregon Trail was first travelled by wagon in 1836, when the missionaries Marcus and Narcissa Whitman took a wagon as far as Fort Hall in modern Idaho. They abandoned it there and finished the journey by pack animal, but they had shown that families could make the crossing. Through the 1840s, ‘wagon trains’ of forty to a hundred families gathered in Missouri each spring, elected captains, and set off behind ox-drawn wagons in early May.

Speed was everything. Trains had to cross the Rockies at South Pass and then the Blue Mountains of Oregon before October, when winter snows could trap them in the high passes. The journey took four to six months. River crossings, dust, drought, cholera and a steady drip of accidents wore down even prepared families — thousands of graves dotted the route. Yet by 1846 the trail was carrying perhaps 4,000 emigrants a year, and by the early 1850s tens of thousands.

The 1849 California Gold Rush

In January 1848 a foreman called James Marshall spotted gold flakes in the millrace of John Sutter’s sawmill in the Sierra Nevada foothills. By 1849, after President Polk confirmed the find in his message to Congress, the news had set off a worldwide rush. Around 300,000 people poured into California between 1848 and 1855 — the ‘forty-niners’ of 1849 alone numbered nearly 90,000. They came not only from the eastern United States but from China, Mexico, Chile, Britain and Australia. San Francisco grew from a village of around 800 people in 1848 to a port city of 25,000 by 1850.

For Edexcel, the importance of the Gold Rush is what came AFTER it, not the moment of discovery itself. California became a state in 1850 — faster than any territory before it. The federal need to link the new state to the rest of the Union helped drive the Pacific Railroad debate that would lead to the Transcontinental Railroad. Chinese migration to California began on a scale that would later spark legislation. Mining camps modelled the boom-and-bust pattern repeated in every later gold strike, including the Black Hills in 1874. And the Plains nations between the Missouri and the gold fields suddenly mattered to a federal government that needed safe overland passage to its newest state.

A Mythical and a Real West

Manifest Destiny, the Oregon Trail and the Gold Rush together created the public imagination of the West that would shape the next sixty years — a story of brave families, providential mission and free land.