Answer: The United States had taken possession of the Philippines (as well as Guam and Puerto Rico) in 1898, after winning the Spanish-American War. Thus US interest in Asia was heightened.
At the same time, other nations had begun competing for "spheres of influence" in trade access with China.
Further detail:
The Open Door policy was issued by the United States in 1899-1900 as a series of dispatches from the US Secretary of State to other nations that had trading interests in China -- Great Britain, Germany, France, Italy, Japan, and Russia. The policy reasserted earlier agreements that all countries should have equal access to ports in China, without undue preference to "spheres of influence" for one nation or another. The United States was seeking to maintain an equal footing with other nations in the access to trade in China.
In 1830 he started an abolitionist paper, The Liberator. In 1832 he helped form the New England Antislavery Society. When the Civil War broke out, he continued to blast the Constitution as a pro-slavery document.
The roman republic was established after a successful rebellion against the etruscans.
Andrew Jackson created the Democratic party and stood for the people who had not really had a voice, unlike past presidents who stood more for the elites and upper classes. Born into poverty, he was able to come out of it and become a successful war hero which helped him become president.
