1 and 4 are the best choices since The barbarian attacks killed many romans and the Huns sacked hundreds of cities in the Roman Empire and caused chaos. I also believe 4 is another reason for the decline, since the religion started about 400 years before the fall of the empire and sparked many different believes and divided the Empire through religion.
If I've got it right, the land area of Greece includes 2,000 islands, only a few are not inhabited. Check it if I'm wrong.
Carl Vinson was very supportive of the US Navy. The first option choice is false, other branches of the US military never lost their funding because of the US Navy. The second choice is kind of true because better ships were built that required fewer people but that wasn't really the major impact. The third answer choice is partially true because Carl Vinson did double the size of the US Navy but other countries still were a threat to the US so this point is false. The last answer choice is true because Carl Vinson's work in naval expansion helped defend Pearl Harbor when it was attacked. The major impact was the last choice. Therefore, the answer is the last choice.
<span>Eisenhower Doctrine, (Jan. 5, 1957), in the Cold War period after world War II, U.S. foreign-policy pronouncement by President Dwight
D.Eisenhower promising military or economic aid to any Middle Eastern country needing help in resisting communist aggression.</span>
