Due to automobile-related jobs in the 1920's employing one of every eight workers, the automobile industry dominated the American economy.

One out of every eight workers were employed in automobile-related jobs in the 1920's, with the American economy being dominated by the automobile industry.

The automobile industry dominated the American economy in the 1920's, with one of every eight workers having been employed in automobile-related jobs.

In the 1920's, the automobile industry had dominated the American economy, when one out of every eight workers was employed in an automobile-related job.

In the 1920's, the automobile industry dominated the American economy, with one out of every eight workers employed in an automobile-related job.