What caused the sharp spike in population growth after the 1700s?

Industrialization (industrial revolution) caused industry to produce excess of goods and provide a better quality life. This lengthened life spans significantly and allowed the mortality rate of people, more specifically children, to start dropping exponentially.

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).