It's called Sea of Marmara
Answer: The four words are Emigrant, Independence, Missouri, Prairie Schooner, and Cayuse.
Explanation:
The Great Migration started in 1916 and didn't end until 1970. This was when the African American citizens moved from the Southern states they lived in to the West, Midwest, and the Northeast regions of the United States.
All of the words listed above are related to the Great Migration. In the early days, they rode in prairie schooners to get to their destination. The Cayuse were resentful of the new settlers and this caused issues at some times during their passage.
Austria-Hungary invaded serbia after the assassination of the arch duke Ferdinand. This started World War 1.
One reason could be that since England has colonized most of the countries in the past, the English language has been spread around. Another reason would be since English speaking countries like the US and Britain are powerful economically, knowing English is very important when making trades and business deals.
The power of the medieval church. Couldn't answer sooner forgive me.