To develop a fair and effective counterclaim to the argument that Washington, DC should receive statehood due to taxation without representation, the most helpful piece of evidence would be:
As the capital of the United States, Washington, DC was never meant to be a state because the founding fathers feared its people would have too much influence.
This evidence directly addresses the foundational reasons behind the establishment of Washington, DC as a federal district, highlighting the intention of the founding fathers and providing a historical context for why DC may not fit the criteria for statehood.