The lord-vassal system in Japan was based on the need for lands in exchange for military service.
Your answer is wrong and I have no idea why your talking about feminism. But anyway the affect of surprise was that the natives Americans enemy wouldn't have time to prepare so the losses/casualties for the enemy would be heavy,also using the element of surprise would also most likely scare enemy soldiers, and they would be distracted and confused as well.
For china and russia Relations between the Soviet Union and China reach the breaking point as the two governments engage in an angry ideological debate about the future of communism. The United States, for its part, was delighted to see a wedge being driven between the two communist superpowers.
C… the first two seem more like strengths
