Is the US imperialistic? Has it ever been?

I believe that the US has been imperialistic to some extent, but is not completely imperialist today, for three reasons:


1. The United States is a member of the United Nations.
2. When the earthquake in Haiti recently happened, the US as a whole made a huge effort to send supplies and volunteers there to help the people as much as possible.
3. The invasion of Iraq was not imperialist because there was no intention of taking over the country, or using it for it's resources. The US was there to intervene in violence and to find Saddam Hussein and any nuclear weapons.


There are also reasons that the US could be considered imperialist at some points in time:


1. In 1898 Puerto Rico was invaded by the US during the Spanish-American war, and though today it does have a republican government, Its current powers are all delegated by the United States Congress and lack full protection under the United States Constitution.
2. During the late 19th and early 20th centuries, the US invaded Latin American countries 32 times. Roosevelt's justification for this was to stop the "chronic wrongdoing" in the Western Hemisphere.
3. The US was part of the overthrow of the monarchical government in Hawaii, and then annexed it to be included as a US state.