He vetoed more bills in his term of office than all the previous presidents put together. Jackson was also the first to use the pocket veto, a delaying tactic in which the President does not sign a bill within ten days of the end of the Congressional term, preventing it from becoming law.
4 years passed between the two events
Answer:
They did not want to be forced from their own land.
Morally--many scientists in particular could predict the devastating effects of the atomic bomb. They urged leaders not to use the technology because they knew the death toll would be huge.
Financially--some also opposed the production of the atomic bomb as being a waste of money. Traditional military weapons were working and some were skeptical that the technology would even work.