It was primarily the "Open Door Policy" that opened relations between china and the united states, since this made it possible for many western countries to engage in trade with China.
During WW2, the women stayed and worked in the factories, to support the men fighting overseas. They used the assembly line to build ships, planes, and weapons. The men also worked in the factories. Women also rationed and sent food to their husbands overseas. This was the time period where women would work in the industry, or work as a WACs.
The printing press helped and encourage the European exploration in the XV century in various ways.
The main consequence is that it was possible to spread the knowledge about this discovery quicker than in the past, making people aware of the progress made and giving to more people the benefits derived from explorations.
As the information travel across Europe and more people knew about the possible advantage of the new discoveries, more people wanted to start their own expeditions.
Moreover, the printing press made possible for explorers to share their difficulties, so they can help future explorations and explorers.
Ultimately, it was the power of the knowledge that the printing press made accessible to more people that powered the Europian exploration of the XV century.
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Constantine now became the Western Roman emperor. He soon used his power to address the status of Christians, issuing the Edict of Milan in 313. This proclamation legalized Christianity and allowed for freedom of worship throughout the empire. For a time, Constantine stood by as others ruled the Eastern Roman Empire.
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