If it is true that...

As industry, commerce, navigation, railways extended, so did the bourgeoisie develop and increase its capital

Then it must be true that...

The bourgeoisie has played a revolutionary part in history

If it is true that...

The discovery of America and the rounding of the Cape opened up fresh ground for the rising bourgeoisie

and

The feudal system of industry no longer sufficed for the growing wants of the new markets, leading to the rise of the manufacturing system

and

Steam and machinery revolutionized industrial production

and

Modern industry replaced manufacture and industrial millionaires replaced the industrial middle class

and

As industry, commerce, navigation, railways extended, so did the bourgeoisie develop and increase its capital

Then it must be true that...

The bourgeoisie has played a revolutionary part in history