It is important because if you dont compromise it could lead to bad things.
They wewre called the serfs/pesants.
The open door policy was principles that was installed in 1899 and then the 1900s to Have a protection of equal or even trading among countries
What could cause you to lose your citizenship of a certain country would be if you decided to betray your country for some reason in some way. This could be done in multiple fashions, one being if you're in the army and you give out a top military secret. This cold make you lose citizenship.