What group of immigrants arrived in large numbers on the U.S . west coast for the primary purpose of working on the Transcontinental Railroad in the 19th century? Chinese Germans Civil War Veterans Irish

# Explanation Step 1<br />The question is asking about a specific group of immigrants who arrived in large numbers on the U.S. west coast in the 19th century. The primary purpose of their arrival was to work on the Transcontinental Railroad.<br />## Step 2<br />The Transcontinental Railroad was a significant project that required a large workforce. The immigrants who arrived in large numbers to work on this project were primarily Chinese immigrants.<br />## Step 3<br />Chinese immigrants were known to have arrived in large numbers on the U.S. west coast during the 19th century, specifically to work on the Transcontinental Railroad. This was due to the labor shortage that occurred after the Civil War and the completion of the Civil War veterans' projects.<br /><br /># Answer: <br />Chinese