Which phrase best completes this list? Results of the Louisiana Purchase
United States doubles in size
American control of the Mississippi River
?
A. Water route to the Pacific
B. Slavery outlawed west of existing states
C. Railroads in the West
D. New conflicts between American Indians and settlers

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.