Source O It is the destiny of our great republic to extend the blessings of liberty and self-government across this entire continent. Providence has granted...

This question asks you to evaluate the reliability of a source about American attitudes toward westward expansion in the 1840s. Reliability questions require you to consider the content of the source, the provenance (who wrote it, when, and why), and your own knowledge to judge how far the source can be trusted.

What the source says: The senator argues that it is America's destiny to spread liberty and self-government across the continent. He claims western lands are "largely empty," criticises Mexico for being unable to govern its northern territories, and dismisses Native American societies as lacking "fixed settlements or organized governments." This language directly reflects the ideology of Manifest Destiny, a term coined by journalist John O'Sullivan in 1845, which held that American expansion was divinely ordained and inevitable.

How reliable is the content? The source accurately reflects genuine beliefs held by many American expansionists. The claim that democratic institutions were superior, that western lands were underused, and that Mexico governed its territories poorly were all common arguments in the 1840s. These attitudes contributed directly to the annexation of Texas (1845) and the Mexican-American War (1846-1848). However, several claims in the source are factually misleading. The assertion that western lands were "largely empty" ignored the presence of numerous Native American nations, many of which had complex societies, agricultural practices, and forms of government. The Indian Removal Act of 1830 had already forcibly relocated thousands of Native Americans along the Trail of Tears (1838), showing that these lands were far from unoccupied.

Provenance and purpose: The source is a speech by a United States senator in 1845. As a political speech, it was designed to build public and legislative support for expansion. The senator had a clear purpose: to persuade others that expansion was justified. This makes it a biased presentation rather than a balanced account of attitudes.

Reaching the highest level (5-7 marks): To reach Level 3, you must go beyond simply identifying what the source says. You need to cross-reference the source's claims with your own knowledge, evaluate both its strengths and weaknesses as evidence, and consider how its provenance affects reliability. The source is reliable evidence of how expansionists justified their policies, but it is deeply unreliable as a factual description of western territories or the peoples living there. Making this distinction between reliability for different purposes is the key to a top-level answer.