Jurisdiction — In general — Territorial and personal — Territorial — Exemptions from and restrictions upon territorial jurisdiction — Foreign States — Whether State-owned corporation liable for acts performed by State — Acts with which corporation has no direct connection — Counterclaims — Expropriation of property of New York bank by Republic of Cuba — Whether New York bank entitled to assert counterclaim based on expropriation against Cuban State corporation unconnected with expropriation — The law of the United States