They would support a policy of imperialism. The late 19th century brought a larger number of people in America to the side of imperialistic action similarly to European countries throughout the 19th century. In 1898, the US engaged in the Spanish-American War and gained their first territories of Puerto Rico, Guam, and the Philippines in addition to Cuba as a protectorate. In the same year, the US also annexed the Hawaiian islands.
New bills can be proposed by the memebers of the House, so you would want to present your idea to one of them, so they can formally propose it as a bill.