They were obligated to fulfill their duty of fighting for the King and their Homelands.
The mongols invaded china with the intentions of having china under the Mongol Yuan rule.
The long wait on angel island took place in America within the period of 1920s. The story depict the struggle of chinese immigrants who fought to escape communism and find a new opportunity on the freedom land.
This writing is considered a historical fiction because it does not provide any concrete evidences of it's actually happened.
Answer is: natural rights, john locke advocated for natural rights.