| A | B |
|---|
| Strengthened American claims to the Columbia River country and made Britain more willing to compromise | Rapidly growing American settlement in Oregon |
| Helped lead to a controversial confrontation with Mexico along the Texas border | Polk's frustration at Mexico's refusal to sell California |
| Sparked bitter feuds over Canadian rebels, the boundaries of Maine and Oregon, and other issues | Strong American hostility to Britain |
| Created widespread popular support for Polk's expansionist policies on Texas, Oregon, and California | The upsurge of Manifest Destiny in the 1840s |
| Turned antislavery voters to the Liberty party and helped elect the expansionist Polk | Clay's unsuccessful attempts to straddle the Texas issue |
| Split the Whigs and caused the entire cabinet except Webster to resign | Tyler's refusal to carry out his own Whig party's policies |
| Heated up the slavery controversy between North and South | The Wilmot Proviso |
| Thwarted a growing movement calling for the United States to annex all of Mexico | The rapid Senate ratification of the Treaty of Guadalupe Hidalgo |
| Enabled the United States to take vast territories in the Treaty of Guadalupe Hidalgo | The overwhelming American military victory over Mexico |
| Increased American determination to annex Texas | British support for the Texas Republic |
