It’s the second one because I believe
The correct answer is:
a. Cotton Mills
During the Reconstruction Era, Cotton became a protagonist in the industrial growth of the Southern States. Southern capitalists sank Money into cotton rather than factories or land. More precisely, they invested in slaves; the average slave owner held almost two-thirds of his wealth in slaves in 1860, much less than he held in land.
After the British won the second Battle of El Alamein, they launched <span>Operation Tunisia Operation Husky Operation Torch </span>to free North Africa from the Germans.<span> On November 8, 1942, the Allied forces landed on the coast of the </span><span>French colonies Italian colonies German colonies </span>in North Africa.<span> The British armies freed 1,000 miles of North African coastline.</span><span> After this victory, the Allied forces freed </span><span>France Tunisia Egypt </span>from Axis control.NextReset
Answer:
Well based on the fact that the very first patented rock crushing machine was made in the year 1830, and the first successful, Eli Whitney Blake's, was in 1858, I'd say the development process was around 30 years.