Prior to world war ii, this was president roosevelt's revision of the neutrality acts: participants in the war in europe could purchase war materiel from the u. s. but only if they paid for them full up front and arranged for the transport of the goods themselves.

False.

Note the word "prior" which suggests that Roosevelt started changing the Neutrality Acts before the war started. This is false, for only after Britain asked for military merchandise did America provide for them.

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a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

there has only been 12 presidents. the 12th president is/was moon jae-in