Which is the best reason for not using a moving car as a reference point?

The code talkers work contributed mostly to

Awriter agreement is what ? a. contact b. investment c. solvency d. tariff

Examine the causes, course, and consequences of united states westward expansion and its growing diplomatic assertiveness (war of 1812, convention of 1818, adams-onis treaty, missouri compromise, monroe doctrine, trail of tears, texas annexation, manifest destiny, oregon territory, mexican american war/mexican cession, california gold rush, compromise of 1850, kansas nebraska act, gadsden purchase).