Hi! I answered this already on my other account.
The disagreement between the large and small states at the convention was over shared powers.
Shared powers were argued over, newly citizens wanted the state to have more power, others wanted the federal government to have most of it.
The debate with a more federal-bearing government was that it will mold back into the monarchy America had just previously escaped.
Federalism was created, and the state had power that the federal government couldn't have.
States now deal with their own issues, separate from the government. Government in the federal government will ALWAYS power over state government.
Have a great day!