At the end of the English Civil War, the monarch was executed and replaced by "Oliver Cromwell", since at first there was a massive power vacuum that needed to be filled.
Maintain a balance in Congress between representatives who supported slavery and those who opposed it.
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.
I only know one and it’s A I believe