To minimize the number of free and slave people in the United States states
Ok I will lol free points btw
Answer: Tanks and military-grade planes
Explanation: Imperialism was about almost everywhere in Europe at the time and around that time most European countries had territories in Africa which lead to constant fighting for the land there. What this lead to was intense fights between nations by them creating proxy wars (militias/Rebel groups) to fight against each other which were being supplied by that country that wants more land for them self. With that it lead to Archduke assassination which lead countries to declare wars on one country which then would mean they would declare war on multiple countries in realty because countries would ally each other and the domino effect went down hill from that. So Archduke assassination was just really a "reason" to fight with another nation for more land (resources).
Rock and roll culture was welcomed by youngsters in 1950.
In the 1960s, drugs became popular and it was a time of the free will and libertine attitudes.
In 1970, the political awareness improved and the rock and roll culture slowly declined.
In 0980, women started working and their role was quite important in the working society, the population expanded, MTV got launched, discotheques rose.
