The act stopped most Chinese immigration into the U.S. and led to the influx of Mexican immigrants instead
Chinese workers had migrated into the country to work in mines and agricultural farms.their exclusion led to the influx of Mexican migrants who took over these manual labor jobs.
Just one month after writing this letter, Lincoln issued his preliminary Emancipation Proclamation, which announced that at the beginning of 1863, he would use his war powers to free all slaves in states still in rebellion (as they came under Union control).