The line graph shows the difference of farms and all farms workers between 1910-2000 in the last century in the USA. Overall the trend is going down for both of them.
First, the biggest change was between 1950-1970 the number of farm and farm workers dramatically fall sharply for forty years. The second major change was in the farm workers, it fell down from 14 million persons in 1910 to around 3 million in 2000. After three decades the number of the farm workers start decline by one million in contrast, the number of farms almost steadily by the end of the period the farms and farm workers number stabilized.
In conclusion, the graph shows social changes in both number for farms and farms worker in the 20th century in the USA.
