Why did europeans set out to explore unknown oceans and seas?

Which action by the us war department angered chief red cloud to the point that he refused to sign the treaty of fort laramie ? a) the killing of buffalo by the united states troops b) the appointment of troops to the powder river basin c) the burning of parts of the powder river basin d) the murder of chief red cloud’s wife

Which of the following areas was not part of roman empire? a: syria c: bridges b: forums d: aqueducts h.e.l.p asap

What event brought rwanda to the worlds attention in 1994?