Which two groups the us boost its world war ii production to record levels?

Answer would be  B.  Labor and Business  On e2020.

an effect of the steamboat's popularity was that people began building canals in the united states and europe. this was done to find another way to transport goods across the country and in that time, transportation using the river was very slow and dangerous. it depended entirely on manpower and the current of the river. that all changed in the late 1700's when steamboats were introduced. they soon revolutionized travel and trade through the river and dominated the waterways. eventually, other means of transportation took over from the steamboats, but there was a time that they the united states to expand to the west.

answer; people where able to travel across the u.s.a faster than any other mode of transportation,travel time was about a week,from coast to coast