Which federal legislation improved transportation within the united states?

I do believe it's the federal aid highway act of 1956

:) Hope this helps!

In June of 1956, after several years of quarrels, the creation of the interstate highways was approved by "The Federal-Aid Highway Act" under President Dwight D. Eisenhower, the bill was also known as "The National Interstate and Defense Highways Act", which significantly improved transportation within the country; an effort to do away with traffic jams, unsafe roads and inefficient routes yet also allowing quick evacuations in case of emergencies; one of the largest public work schemes in USA's history.

Explanation:

in all honesty, it really hasn't. except that hitler killed himself.

d. it spread christianity. i just took the test and got it right.