Which Scottish immigrant became a billionaire during the Second Industrial Revolution bu introducing the Bessemer process to mass p Scroll More v Pel and vertically integrating the B. Cornelius Vanderbilt A. Andrew Carnegie D. John Jacob Astor C. Henry Clay Frick

## Step 1<br />The question is asking for the name of a Scottish immigrant who became a billionaire during the Second Industrial Revolution. This person is known for introducing the Bessemer process to mass production and vertically integrating the steel industry.<br />## Step 2<br />The Bessemer process is a method for mass production of steel from molten pig iron before the development of the open hearth and the basic oxygen process. This process was a significant innovation during the Second Industrial Revolution.<br />## Step 3<br />The person who introduced this process and vertically integrated the steel industry was Andrew Carnegie. He was a Scottish-American industrialist who led the expansion of the American steel industry in the late 19th century.<br />## Step 4<br />Carnegie became one of the richest men in the world through his investments in the steel industry. He was a pioneer in the use of the Bessemer process and played a crucial role in the expansion of the American steel industry during the Second Industrial Revolution.