Similar--both control economic resources and typically expect a market to rise out of the imperialism.
Difference--settler colonialism the people from the home country make a home in the new colony establishing political, social, and economic systems. In economic imperialism, only a few people from the home country may make a home in the imperial land but mostly the social structure is left alone and even the political structure is left untouched unless it is not kind to the home country. It is focused on resources and markets with businesses often owned by the home country.
Initially argued for "massive retaliation" toward enemies of the US. He argued for military buildup and involvement in the Vietnam War. McNamara began to question US involvement and began a study on military in Vietnam. This study is now referred to as the Pentagon Papers.
