Final answer:
The Open Door Policy in China sought to ensure equal trading rights, the purchase of Alaska expanded U.S. presence in the Pacific, the McKinley Tariff impacted the Hawaiian sugar industry, and the U.S. gaining control of Pacific islands resulted from the Spanish-American War.
Step-by-step explanation:
The events of the Open Door Policy in China, the purchase of Alaska, the McKinley Tariff of 1890 (Hawaii), and the U.S. gaining control of Pacific islands were all significant developments in U.S. history during the late 19th and early 20th centuries.
The Open Door Policy in China was initiated by Secretary of State John Hay as a means to ensure that all countries had equal trading rights and privileges in China. It sought to prevent the colonization and division of China by European powers, allowing the United States to have access to Chinese markets.
The purchase of Alaska, also known as Seward's Folly, was the acquisition of territory from Russia in 1867. This allowed the United States to gain valuable resources such as gold, oil, and fish, and expanded its presence in the Pacific.
The McKinley Tariff of 1890 imposed high tariffs on sugar and other goods from Hawaii, which greatly impacted the Hawaiian sugar industry. This ultimately led to the overthrow of the Hawaiian monarchy and the eventual annexation of Hawaii by the United States in 1898.
The U.S. gaining control of Pacific islands, particularly the Philippines, Guam, and Puerto Rico, occurred as a result of the Spanish-American War in 1898. The United States emerged as a global power and sought to establish control over strategic locations in the Pacific for military and economic purposes.