What new weapon caused the loss of life on boats, at one point targeting an american ship and resulting in the death of over 120 americans

In March, 1915, the U-Boot took down the RMS Lusitania. It is believed that, even though it was a supposed to be an innocent merchant boat, it could be carrying over 10 tons of weapon with it. 1195 lives were lost. Of those, 123 were north-american civilians.

The answer is The U-Boot

could you send me the choices?

a more perfect union: the creation of the u.s. constitution. the vote was unanimous. saddled with this weak government, the states were on the brink of not to lend a hand to any proceeding that seemed to pose a threat to that protection. delegates from virginia and other large states demanded that voting in