Why is it important for historians to corroborate information found in a source?

The chart shows data on the construction of dreadnoughts, or armed battleships, by 1914. (look at chart provided) a logical conclusion that can be drawn from this chart is that britain and germany were a.)engaged in an arms race. b.)looking for ways to cooperate. c.)hoping not to fight on land. d.)the strongest nations on the earth.

James ll caused problems during his reign because his religion was: protestant lutheran catholic

What action of the british government that led to the constitution