for that reason - and this isn't the only issue but it's currently the most important one - the chinese are trying to smash their way through myanmar to the indian ocean to build a port, much as the russians were trying to do in afghanistan during the great game. they face overt and covert opposition to this by british, american and indian forces operating in myanmar. british infiltration of myanmar is particularly profound and particularly deep; this is the most recent iteration of a conflict between the british and chinese that goes back to the 1700s, and predates the revolutionary war in the united states.
it's not well known that there were indian regiments in the british garrison during the american revolutionary war - that indian troops fought on the side of the british. this is in addition to the native american forces.
however, that isn't what the order is about. the order is about overstays. it is reasonable for the americans to send a strong message to countries that don't respect their international agreements. canada also has a serious overstay problem that needs to be addressed, but i wouldn't propose a total ban, as that is neither fair to those that do follow the rules, nor is it really in our self-interest.