A few wished to go farther. Some proslavery advocates, worried that the booming white settler population might crowd out slavery, sought room for their way of life farther south. They staged a series of “filibusters,” private invasions of Latin American republics that, they hoped, would lead to annexations. The most dramatic was William Walker’s invasion of Nicaragua in 1855, which improbably propelled Walker briefly to the Nicaraguan presidency.
Tension between the white settler population boom, between not enough white settlers for induction into union and too many white settlers for slavery to be profitable
