I believe that the answer to the question given above is that the size of brain are is defined on how strain or how used is that specific body part.
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The sentence which is outside the focus of this paragraph is the very last one:
<em>Washington married Martha Custis, a wealthy widow.</em>
The entire paragraph is about the American Revolution, and Washington's involvement in it. His leadership is commended and the outcome of the revolution is revealed.
Even though the last sentence is about him, that is, about who he married, the focus is shifted: from the topic of him as a general, to an extra piece of information about his private life.
Jamestown was named after the king James I, <span>the first
colonists at Jamestown would have starved to death in the first winter. The
local Native Americans would not trade with the settlers but they always had respect
for the new comers and they helped them with planting and growing food. </span>After a short time the whites betrayed to Indians, t<span>hey had learned many things about harvesting from them
but instead of this they become greedy and betrayed them.</span>
