I believe the answer is: <span>British expeditionary force
</span><span>British expeditionary force was a group of soldiers that created in world war 2 in order to help the fight against nazi in the western front.
At that time, The French surrendered to the nazi only within 30 days the nazi's initial attack and the </span><span>British expeditionary force was sent there to help its ally. But the nazi's forces got the better of them in the combat and they're forced to escape from Dunkirk.</span>
Because it covers up most of the central and northern parts of mexico
Light Green, brown, purple, blue
, is the answer.
