RISK suggestions and feedback

[True Federalist (진정한 연방 주의자)]

I agree that Canada is a problem, simply because it borders so many other territories,  11 in all.  However if you remove Canada you'll need to either redraw the Regions or reduce the New England bonus because it becomes so easy to defend.  Another possibility besides splitting Canada or giving it more armies is to allow it to use what it has more effectively.  Allow the Canadians to use 3 or 4 dice on defense.  You might also make the Canadians revolting. I.e, at the start of each players turn, if they hold Canada, it suffers from a 1 to 3 battallion attack from the Free Canadian forces.

Mexico borders few enough states to not be a problem, as all it does is serve as a California to Texas shortcut.

Also, if you want to prevent another Everett style blitzkrieg in a game of Capital Risk, you could add the rule variant of a 12 battalion limit per territory.

[True Federalist (진정한 연방 주의자)]

Only problem I see is that is serves as a bit of a bonus for whoever goes first as they'll be easy conquests.  Two random neutral states with 5 battalions would be fairer.

[True Federalist (진정한 연방 주의자)]

But the neutrals don't get reinforcements, so either they need more battalions than average or a means of being reinforced to be competitive.
Alternative idea
How about the neutrals can't be invaded but if you turn in a set of RISK cards with them, you get the State and the 2 battalions.  While the State is untouchably neutral you get 1 less battalion for holding the rest of the States in its region.

[True Federalist (진정한 연방 주의자)]

One possibility would be to add the rule from Castle RISK that attacks on a capital can only be made with 2 battalions instead of 3.