Polk acquired the Oregon territory from Britain, got the entire southwest from Mexico during the Mexican War, and his predecessor took Polk's election as a sign that the U.S. wanted to add Texas to the Union so Texas was added shortly before Polk took office. Polk is by far the most underrated president. He was elected on an expansionist platform and nearly double the size of the U.S. in 4 years.
McKinley didn't buy Alaska. I think that was Secretary of State Seward during the first Johnson administration. McKinley was in charge during the Spanish-American war.
The presidents between Jackson and Lincoln (sans Polk) basically sat around twiddling their thumbs waiting for the country to fall into civil war. That's why no one remembers them. The reconstruction presidents sat around comparing their fancy facial hair and twiddling their thumbs as corruption and corporate powers pulled the levers of government. Teddy Roosevelt restored the power of the Presidency.
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