How did the government aid the expansion of the railroad industry during the middle and late 19th century? by using price controls to ensure profits by providing land grants for development by raising tariff rates to prevent foreign competition by preventing unionization of railroad workers

pls be more elaborate

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.