This was an interesting project. I compiled the monthly job creation data from the Fed for every month on record and broken it out by who was president at the time and what party they were in.

Hypothesis

Let’s start with what I was expecting to find. I hypothesized a slight Democratic lead with maybe a few percent more versus Republicans.

Results

Well the hypothesis was correct for the monthly averages. For the last 981 months since 1939, Democratic presidents have seen an average of 55% of all monthly job growth. Republicans have seen an average of 45%.

In the words of Benjamin Franklin, compound interest is the most powerful force known to man.

When you compound a small but consistent advantage over nearly a thousand months, it becomes a huge advantage over time. It turns out that 72% of all jobs created in the United States since 1939 were during Democratic administrations. Just 28% of jobs were created under Republican administrations.

Here is the raw data visualized by party;

Now I know what you’re thinking, it’s not fair to include the unparalleled scope of Donald Trump’s failure. Well actually, if we leave Trump out of the total, it barely changes. Ignoring Trump, Democrats are still responsible for 69% of all jobs created throughout the last 981 months isnce 1939.

Here is the same graph again, with Trump omitted;

As you can see, even without Trump, the blue lines are generally higher than the red lines. This is confirmed by the dotted trendlines over time, showing a significantly higher trend for the Democrats over the Republicans, even without the outlier of how bad Trump’s presidency was.

Conclusion

Conducting a two-tailed t test for difference of proportions, we find that there is a significant difference between these groups, which seems obvious based on the data. (The value of z is 12.0579. The value of p is < .00001. The result is significant at p < .05.)

Final Word

The data speaks for itself. I wasn’t expecting to find such a stark difference. I will certainly start citing these results in many essays moving forwards!

You can download the data and calculations here. Please take a look and send me your feedback. I’d love to hear from anyone who can poke holes in the analysis or explain how we have managed to ignore such a significant difference for the last century.