If there are 10 mil illegals, I fail to see how 180 thousand could be of any consequence.
Old-order Amish have up to 9 kids per family, Hutterites have about 6. If our numbers start to decline and there is room for more Amish, in a few generations there will be a few million of them. Population decline is not a crises in this country. In Europe it is a problem because they don't tolerate fundamentalist Christians like we do.