Even once formal police forces had been established, the sheriff continued to be an extremely important role -in big cities, where extra police force was always needed
-in all of the above
-in port cities
-in rural areas, such as the American West

the language dates from the contacts of arabian traders with the inhabitants of the east coast of africa over many centuries. under arab influence, swahili originated as a lingua franca used by several closely related bantu-speaking tribal groups.

d is the answer. leo should include the source.

the steam engine.

the locomotive.

the telephone.

the telegraph.

the internal combustion engine.

the rifle.

ironclad ships.

electricity/light bulb.

paper money known as continental currency, or continentals.