Basically, before the U.S. entered World War 1, they made Germany promise not to sink merchant and civilian ships. They had to search the ship first and only sink it if there was contraband found aboard the vessel, after allowing the crew and passengers to have safe passage somehow. Previous to that, Germany had been sinking ships left and right, with no prior information that they were military or civilian ships.
Answer:
literally because funny books are great
This is false. The nomadic lifestyle didn't attract many humans in general.
I believe the answer is C: For thousands of years all over the world, people had enslaved other people for a variety of reasons. The earliest records of slavery began in the 18th century BC in Babylon.