In Schneider v. Rusk, 377 U.S. 163 (1964), the Government unsuccessfully attempted to justify a statutory inequality between naturalized and native-born citizens under the foreign relations power.
In Gonzales v. Landon, 350 U.S. 920, we held that the rule as to burden of proof in denaturalization cases applied to expatriation cases under Section 401(j) of the Nationality Act of 1940.
Granting citizenship to a child of one U.S.-citizen parent and one non-U.S. citizen parent provided that the U.S.-citizen parent was physically present in the United States for at least ten years—including at least five years after attaining the age of fourteen—before the child was born
Providing that United States nationality may be lost by "voluntarily performing" certain acts "with the intention of relinquishing United States nationality"