Why had transportation made so few improvements?

people and goods did not travel far.
the new transportation was too expensive for the common man.
the technology was not available.
transportation had improved in europe but not america.

uncle sam would be tossing and turning in his grave : *)

what the question i might be able to

your answer is 1930's

explanation

this is just around the time the great depression was starting and putting the us ecnomy into ecnomic failure causing the goverment to take a much larger rule to try and pieace it back together