What was the pony express and why was it so fast

since speed was its main goal, the Pony Express went to great lengths to keep its horses' loads as light as possible. Rather than burly cowboys, most of the riders were small, wiry men who weighed between 100 and 125 pounds—roughly the same size as a modern horseracing jockey.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations. click to let others know, how is it

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.