Islam gained momentum during the 10th century in West Africa with the start of the Almoravid dynasty movement on the Senegal River and as rulers and kings embraced Islam. Islam then spread slowly in much of the continent through trade and preaching.
Castro declared that he would assassinate US president Dwight Eisenhower and destroy the US government
and Castro started manufacturing hydrogen bombs with the help of communist china
Russia struggled to modernize, is the answer to your question
