Put the following events in chronological order by numbering them 1-6, one being first and six being the last event to take place.

__The Manhattan Project is started to make atomic bombs.
__The US is neutral, so they are not directly involved in the war.
__After Roosevelt's death and peace with Germany, the atomic bomb is dropped on Japan ending World War II.
__The US declares war on Japan and is officially involved in WWII.
__Germany invades Poland starting World War II.
__Pearl Harbor is attacked by Japan on December 7th, 1941​