motor neuron, one of various efferent nerve cells that transmit nerve impulses from the brain or from the spinal cord to muscular or glandular tissue. According to location, some kinds of motor neurons are the peripheral motor neurons and the upper motor neurons. Also called motoneuron.
The Zimmerman telegram probably had a peripheral effect on breaking the isolationist sentiment in the US in WWI. Relations with Mexico were strained already (Veracruz was occupied) but once Huerta was gone, the Mexican neutrality in the World Wa...
This is a big turn around in their attitude towards the War. In 1914, they wanted nothing to do with it, but in 1917, they joined the war against Germany as they had had enough of their Unrestricetd Submarine Warfare and were angry because of the Zimmerman Telegram.