Which group of laborers were recruited and employed by the railroad companies to lay thousands of miles of track over the West's rugged terrain?

Under __________, most jobs in the federal bureaucracy are awarded on the basis of skills and expertise

Fill in the blanks with correct word

Which of the following was most responsible for Great Britain’s increased desire to exert centralized control over its colonies?

a. threat of foreign invasion b. increasing military debt c. threat of internal revolution d. increasing foreign interference