The answer is the Federalist Party's belief in a strong central government.
The Federalist Party, led by Alexander Hamilton, advocated for a strong central government. This belief aligns with the idea of national regulation of trade between states, as it involves centralized control and oversight, which is a characteristic of a strong central government.
The Democratic Republicans, led by Thomas Jefferson, favored a strict interpretation of the Constitution, which typically meant limiting the powers of the federal government. This stance would not support national regulation of trade, as it would likely be seen as an overreach of federal power.
While the Federalists did support protective tariffs, this is more related to international trade and economic policy rather than the regulation of trade between states.
The Democratic Republicans believed in strong state governments, which would oppose national regulation of trade between states, as it would infringe upon state sovereignty and autonomy.