Wiktionary
facts on the ground
n. 1 (context literally English) Some aspects of the situation in a particular location. 2 (context idiomatic English) A euphemism, similar to fait accompli, used as an oblique way of saying that discussions over the possession of a given piece of territory has been rendered moot by the presence of military forces.
Wikipedia
Facts on the ground
Facts on the ground is a diplomatic term that means the situation in reality as opposed to in the abstract.
Usage examples of "facts on the ground".
For if the balance tips toward Israel the UN Security Council may well impose a speedy cease-fire, and Israel needs facts on the ground to trade off for an Egyptian withdrawal.