What significant contribution did emperor constantine make to roman history? a. he made vast contributions in science and medicine b. he was a great philosopher and writer c. he supported christianity d. he introduced a special legal system

C. he legalized Christianity and worship.

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.