Take a look at the time involved in travel from NY to San Fran add the Atlantic crossing time and then add any manuevers required to defend against US warships...
From England to India... then from India to San Fran...
Not feasible... easier, cheaper and less time consuming to make a landing on the Eastern seaboard somewhere.
You have to feed the men, pay them care for horses for the
arty and
Cav... etc. It's more than lines on a map.