30 states have passed the right
Settlers were constantly taking more land than either they agreed for, or just what didnt belong to them, the Indians would fight back and lose in the end, they would shrink back and find more land, there would be peace for a little while, and then settlers would keep wanting more land
Whenever a river recovers after a flood, the soil that isn't covered is called silt.
If im correct the answer should be Submarines and mines were an inexpensive and better way to engage battleships. I hope this helps. let me know if it doesnt
