What caused many mountain men to become travel guides?

Mountain men is a term for male trappers or explorers who lives exclusively in the wilderness. They were popular and romanticized during the 18th century. They were vital in settling new territories and opening up new wagon trails that travelled through the North American Rocky Mountains due to their knowledge in the geography of the area. Later in life, many of these mountain men were hired by wagon companies and fur trading companies as guides or hunters.

both include an amendment process.

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.