How did incidents like the gulf of tonkin resolution and the secret bombing of cambodia eventually affect the relationship between the legislative and executive branches of government?

The correct answer is that the Congress attempted to limit the president’s ability to act unilaterally.

This was because the two mentioned war efforts were conducted with the will of the president alone, without the support of the congress. The congress wanted to limit the presidential executive power then to prevent them from participating in such things or initiating wars without the approval of the congress.