Pandas DataFrame visual

[snippsat]

After adding print('-' * 50) columns are aligned. Not sure how this code exactly solved the issue

It's the way you combine Series to a DataFrame.
After States will have no index/column only area and pop.

>>> data.columns
Index(['area', 'pop'], dtype='object')

So to fix this use reset_index() and give a name.

>>> data = data.reset_index()
>>> data.columns
Index(['index', 'area', 'pop'], dtype='object')

# Rename to a useful name
data = data.rename(columns={'index': 'States'})

>>> data.columns
Index(['States', 'area', 'pop'], dtype='object')
>>> 
>>> data
       States    area       pop
0  California  423967  38332521
1       Texas  695662  26448193
2    New York  141297  19651127
3     Florida  170312  19552860
4    Illinois  149995  12882135 

There is no problem in doing this way to fix it.
I don't now how data is collect or that you have to combine two pd.Series like this.
There maybe is a way to make usable DataFrame for raw data,
but using reset_index() is a common way to fix thing to a usable DataFrame.