Answer:
I'd say A. a string of Continental army victories made the end of the war seem close.
Explanation:
During the first two years of the Revolutionary War, most of the fighting between the patriots and British took place in the north. At first, the British generally had their way because of their far superior sea power. Despite Washington's daring victories, the British still retained the initiative. Indeed, had British efforts been better coordinated, they probably could have put down the rebellion in 1777. Patriot forces, commanded by General Horatio Gates, achieved a significant victory at Saratoga, New York, in October 1777. Within months, this victory induced France to sign treaties of alliance and commerce with the United States. In retrospect, French involvement was the turning point of the war, although that was not obvious at the time.
Germanys resumption of submarine attacks and merchant ships in 1917
Spain was the European country that colonized Mexico and southwestern US
Not sure about this, but my best guess would be the MH370 where it crashed somewhere in the Indian Ocean.