Final answer:
Charles' foreign policy caused instability in England through his failure to adopt reassuring policies and worsening existing problems. This led to a weak country abroad and severe divisions at home.
Step-by-step explanation:
Charles' foreign policy caused instability in England through his failure to adopt policies that reassured the English people and maintained stability. Instead, Charles worsened problems such as England's decline in European affairs, rebellion and persecution of nonconformists, and a lack of cooperation with Parliaments.
This resulted in a weak country abroad and severe divisions at home. When Charles died in 1685, his brother James inherited this unstable situation.