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France went into World War 1 because it had an alliance with Russia. When Germany declared war on Russia, France went to help its ally.
Germany used the Schlieffen plan to go through Belgium to get to France, overpower them in a matter of weeks and go back and defend Germany's borders from Russia.
Austria was militarily far better organized than France was at the time. Robespierre fully expected France to be defeated by the Austrians should war commence.
US, England, France, I think Austria, Germany, and Russia did not attend. But you might want to go to wikepedia for that.
The best time to go France is either in spring (Apr-June) or fall (Sept-Nov). July and august are considered as the worst times to visit France.