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that would create interesting situations. 

alliances, if Germany attacked Poland. Poland could call their ally Sweden to help!

a USA mode where the 50 states fight.

Scotland, wales and northern Ireland could become independent. 

1918,1939,1750 time periods ext.

Historical battles such as D-Day, the allies start off with only Britain and french coast they must push forward to recapture  Paris. 

Nukes, rarely used. In the last moments of Britain, Russia ext. they have a chance of launching a nuke at the aggressor.

WW2  and WW1 scenarios.

American civil war/ revolution scenario.

add the ability for countries like Russia to invade Alaska as this can cause more interesting scenarios.

Puppet states.

colonization of Antarctica.   

Some of these are hard to make without a large team but the 3 this game needs in my opinion are :

allies

ww2 and ww1 borders

puppet states.

thank you,