Compare and contrast william walker's expansionist goals, methods, and effectiveness to that of james k polk's. answer thoughtfully with specific evidence

William Walker was known for his "filibustering" - conducting private militarial journey to Latin America with the goal of spreading the English language and colonization. Because of this, he became the president in the Republic of Nicaragua from 1856 to 1857 until he was defeated and executed by the Honduras on 1860.