What does washington say can happen when people have a "passionate attachment" to one nation

In George Washington's words "A pasionate attachment of one nation for another produces a variety of evils".

With this statement, as well as a many others in his famous Farewell Address, what Washington was mainly trying to warn the American people about is that becoming fanatical of any political party or overly-obsessive about geographical divisions would always set-up injustice. The privilege of any Nation always comes at the expense of others when sympathy grows into an illusion of "an imaginary common interest". Also of much importance, alliances must be chosen wisely as to not end up betraying the interests of our own Nation in order to defend these alliances. When they're formed without good justification, we end up wrongly following blind and passionate attachment instead of reason.

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they made rome the dominant power in the mediterranean.

this means that germany had to pay the allied countries. reparations are/is essentially payment for something that they have done wrong, so after ww1, germany was forced to pay reparations so they could replenish the allied countries resources' that they had lost during the war.