This is not true, since the 1990 the us was strongly opposed on the eu building or relying more on own defense industry and more closely aligned defence policy, even threatening end of NATO. Lookup the "three Ds" articulated later by Secretary of State Madeleine Albright: No Duplication of NATO assets, No Decoupling of European security from the US, and No Discrimination against NATO members who were not in the EU.

Nothing, only the gentle hand of US influence over their internal affairs, and the typical nationalistic bickering among themselves.