All purchases of land, tenements and hereditaments, within this commonwealth, not exceeding two thousand acres, heretofore made by any alien or aliens and in all cases where such alien or aliens shall have inherited the same by descent or otherwise, the title of such alien or aliens is hereby confirmed; and it shall be lawful for such alien or aliens to hold the same as fully and to all intents and purposes, as any citizen of the United States might or could do: Provided, That nothing herein contained shall, in any wise, affect or impair the vested rights of any individual or individuals.
68 P.S. § 31