The U.S wanted Hawaii to be imperialized as soon as they discovered it. So a large group in senate tried to ratify the annexation of Hawaii but failed. When William McKinley took presidential office the tides began to change on the opinion of Annexation. The United States eventually had an agreement with the Queen of Hawaii to have American citizens settle peacefully in the country of Hawaii. The United States wanted to annex Hawaii so they can build navy bases in the pacific.
The Open Door Policy falls under the category Intervention. The Open Door policy is a concept in foreign affairs, initially used to refer to the United States policy in the late 19th and early 20th century. The policy would grant multiple international powers with equal access to china, with none of them in total control of that country. The policy was aimed to safeguard Chinese Sovereignty and territorial integrity from partition.
The U.S had a new acquired colony after they won the Spanish-American war and that colony was the Philippine islands. The United States increased its Asian presence and was expecting to further its commercial and political interest in China. The U.S was scared that they might lose access to the Chinese market should the country be partitioned because of the stronger influences in