What was happening in America during the Gilded Age that lead to rapid population growth in cities?

What was going to be the third wave of japanese attack planes' targets? (if this attack had come, the us navy would have been even more crippled) question 5 options: 1 airfields 2the aircraft carriers 3 fuel depots and ship repair facilities 4 battleship row

List two inventions that were invented in the united states before the american civil war

How do you think sintonis fiancée reacted to receiving this letter?