What challenges do U.S. banks face when expanding internationally?

"For U.S. banks, expanding internationally can be difficult. Banks in other nations are often subject to fewer regulations than U.S. banks, making it easier for them to undercut American banks on the pricing of loans and services. Some governments also protect their banks against foreign competition. For example, the Chinese government imposes high fees and limits the amount of deposits that foreign banks can accept from customers. It also controls foreign-bank deposit and loan interest rates, limiting the ability of foreign banks to compete with government-owned Chinese banks. Despite the banking restrictions for foreign banks in China, many of the large U.S. banking institutions continue to do business there."