Answer:
The Constitution has three main functions. First it creates a national government consisting of a legislative, an executive, and a judicial branch, with a system of checks and balances among the three branches. Second, it divides power between the federal government and the states. And third, it protects various individual liberties of American citizens.
Hamilton believed that the federal government had powers to do whatever was "necessary and proper" in exercising leadership beyond its specifically enumerated powers.
A key example was Hamilton's argument for the creation of a national bank, which was not specifically stipulated by the Constitution. Hamilton's argument was based on the "necessary and proper" clause of Article I, Section 8, of the United States Constitution. After enumerating a number of the powers of Congress, including borrowing money, coining money, regulating commerce, etc, Section 8 of Article I closes with by saying Congress shall have power "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, or in any Department or Officer thereof."
Hamilton favored a loose interpretation of the Constitution -- in other words, that the Constitution allows for anything that is not strictly forbidden in what it has expressly stated. A national bank was not strictly listed as something Congress could establish, but there was nothing in the Constitution to prohibit it. And the "necessary and proper" clause gave leeway to create it.
Overall, Hamilton favored a stronger federal government than did some of his peers among the founding fathers.
provide for the common defense
Linking the Atlantic and Pacific oceans is called a transcontinental railway. This is a means to make trade and commerce easier and faster. These railroads will open a lot of opportunities for the western world to explore the rich countries of the east. It will open unpopulated regions and allow for the west to create networks within the Asian and Atlantic continents.