How did the United States government motivate the Union Pacific and Central Pacific to complete the construction of the Transcontinental Railroad?

Why did the iraqi governing council have difficulties developing an interim constitution? a. iraqi factions insisted that american forces must leave iraq first. b. the u.n. refused to assist them because the u.s. invaded without its consent. c. they were not given adequate funds to do so. d. there are substantial ethnic and religious factions in iraq.