HELP?!
The main factor that slowed construction of the Central Pacific railroad was
A: a shortage of supplies, which had to be shipped around South America.
B: intense summer heat that melted the railroad ties and tracks.
C: scarcity of wood used for building railroad ties and trestles.
D: conflicts with American Indians who closed down the tracks.

The correct answer is a shortage of supplies, which had to be shipped around South America.

Although the government gave land to the railroad companies to accelerate the development of a transcontinental railroad, there was still a challenge of supplies which slowed down the construction

thanks to  another person

nuclear fission produces the atomic bomb, a weapon of mass destruction that uses power released by the splitting of atomic nuclei the fighting in iwo jima and okinawa affected the allies' pacific strategy because truman decided to drop the atomic bomb on mainland japan.

answer:

won re-nomination with no opposition he also had the support of his party

explanation:

it saw incumbent president andrew jackson, candidate of the democratic party, defeat henry clay, candidate of the national republican party. jackson won re-nomination with no opposition, and the 1832 democratic national convention replaced vice president john c. calhoun with martin van buren.