For how long was Britain a republic under the leadership of Oliver Cromwell?
11 years
Britain was a republic from the execution of Charles I in 1649 until the Restoration in 1660: 11 years.
Correct answer
12 years
12 years would extend the republic to 1661, but Charles II was restored to the throne in 1660.
10 years
10 years would only reach 1659, one year before Parliament invited Charles II back.
9 years
9 years would end in 1658, the year Cromwell died; the republic lasted until 1660.
Explanation
Britain was a republic under the leadership of Oliver Cromwell for 11 years.