In which area did reagen fail to achive his goal
cut spending.
reduce the size of government.
eliminate most government regulations on buisness.
balance the national debt.

The answer is balance the national debt.

Explanation:

President Reagan was a revolutionary president who brought in major progressive changes to the US economy and the financial system through his policies which were named as "Reaganomics".

However, his national debt management put USA with a large trade deficit and the world's largest external debt!

a is the final : )