In the 1830s and 1840s, the system accounted for more than three-quarters of U.S. federal employees.
After the 1840s, all federal employees were accounted for by the system.
mnli hypothesis: After the 1840s, all federal employees were accounted for by the system. premise: In the 1830s and 1840s, the system accounted for more than three-quarters of U.S. federal employees.