Legion keep them from throwing their weight around but I doubt they would attack house out right if he simply said no. Legion was not in the Mojave when NCR came and Mr.House set up the strip.
Yes and no. The NCR, while they want to, they will never charge in like barbaric tribals. In the words of House, 'There's just one reason they haven't
contrived some outrage to justify invading The Strip....' The NCR, much like any government entity in the world, will always make some sort of accusation of being slighted so that they may march in and take what they wish and leave the rest to rot. While the NCR will not storm in without 'cause', the mere fact they would most likely go running in with the claim of 'HOUSE HAD IT COMING THAT WE MARCH IN BECAUSE......'
Like it or not, the Vegas region is House's by claim, seeing as he had set up there first. Then NCR came along, THEN Caesar came along last. So in all impartiality, NCR is also a foriegn invader like the Legion, the only difference is NCR is willing to make parley, where as the Legion does not do diplomacy.
Make no mistake, I don't hate NCR, but their behavior strikes a cord with me because it reminds of certiant things I won't say because politics is a no no here. :laugh: