Wars now fought in following ways - a) financially via trade wars, currency debasing and open and not so open government takeovers b) drones and cruise missiles. While we seeing early stages of this phase and all-around stalemate, just like WW1 trench warfare methods will get refined and someone will emerge dominant with optimal strategy.

When was the last time a country took over another one by process A or B?

Tas is right, the "war" was over in each country in a few weeks. What was lacking was the will to win. Compare the "occupations" of Japan or Germany with the ones in Iraq or Afghanistan; the latter can scarcely be called occupations.
In order to achieve victory, the enemy must know and accept that he has lost, and be willing to give up. That didn't happen in Korea, Vietnam, or any of the middle eastern wars. The enemy was allowed to remain and hide. Did you know that military-age Germans were held in POW camps until 1948? Not hard to find terrorists when everyone else is locked up.

This century will be twice as bloody as the last; watch what happens when you get your way and the US has the same global status as Belgium. Unparalleled bloodshed in every corner of the globe, and nuclear weapons.

KGB Darkfall