Please help me How did feudalism help the economy?

It reduced the risks of trading between communities.
It allowed serfs to earn more money and purchase land.
It gave women a way to participate in trade.
It ended military conflict and allowed for a focus on trade.

Which of the following was not a result of the attacks of 9/11or the war on terror? a. tightening security at airports b. an increase in public displays of patriotism c. a growth in the number of conspiracy theories about the government d. an increase in the number of hijackings worldwide