1) The structure of the building was undergirded by strong support beams.

2) The research findings were undergirded by reliable data and thorough analysis.

3) Her argument was undergirded by solid evidence and compelling reasoning.

4) The success of the project was undergirded by careful planning and attention to detail.

5) The author's message was undergirded by a foundation of empathy and understanding.

6) The peace treaty was undergirded by years of negotiations and diplomacy.

7) His confidence was undergirded by years of experience and skill development.

8) The company's growth was undergirded by a strong customer base and innovative products.

9) The government's policy decisions were undergirded by expert advice and consultation.

10) The partnership was undergirded by shared values and mutual respect.