Relationships between the two countries worsened
The relationships between the two countries worsened despite Carter strong intent to normalize relation between the two countries. This was caused by Cuba adventures in Africa and his sending of prisoners to the USA.
Chlorine and Mustard gas are types of poison gas, sometimes used during chemical warfare. For example Germany introduced their usage against the Allies during WW1.
In his old age he became a communist and during the cold war it was just too tough to be a communist in the US. He went to Ghana after it became the first African country. DuBios has worked for African independence all his life, and was invited to enjoy it by Kwame Nkrumah, his old friend, and Ghana's first president.
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Like in medieval Europe, Japan developed a feudal system dominated by a warrior aristocracy outside of the weak central government. The emperor was the head of feudal society in name only. The shogun, the military commander, held the real power. The shogun gave lands to vassal lords, daimyo, who supported him.
led an expedition to explore the headwaters of the Arkansas and Red Rivers and to report on Spanish settlements in the New Mexico area.