Study the graphs. in what time period did hydroelectric power usage reach its peak?

The correct answer is "1900-2000".

The graph represents hydroelectric power (y axis) along time (x axis). From 1950 to 1970 the usage of this type of power grew steadily.  From this moment on, some peaks and valleys can be observed in the graph.  Although other maximums had been registered in the usage of hidroelectric power, the highest peak took place in the decade of the 90s-00s. This peak was followed by the worst decline experienced since 1970.

1. artillery

2. jose san martin

3.their economies remained dependent on outside powers.

4. drafted new economies

5. democracies have replaced dictatorships

d - failures.

the only attempted british colony in north america before 1600 was roanoke, virginia, which was a total failure. england claimed several areas, including newfoundland, but made no sustainable attempts to colonize them before 1600.