1- France and Russia had deep hostilities for one another and the alliance was unlikely to last.
The Franco-Russian alliance meant the overcoming of the problems that both nations dragged since 1871 in the diplomatic field and the conjunction of interests in opposition to those developed by the German Empire and the Triple Alliance. Franco-British relations were improving since 1900, the barrier generated by colonial issues was overcome with the signing of the Entente Cordiale in 1904.
2- The United States supported the Triple Entente because its citizens leaned toward that alliance due to the cultural connection to England.
American public opinion moved steadily against Germany, especially after the atrocities in Belgium in 1914 and the sinking of the RMS Lusitania in 1915. They considered Great Britain a close nation, with the same values and a common history (beyond that of the armed confrontations that they had had in the past against this country).
During the first years of the war, the USA remained neutral, but trading with the allies, especially with Great Britain. In 1917, with the entrance to the war, the United States sealed the alliance with the United Kingdom that remains until today.
