Final answer:
In 1900, Europe was the continent with more steel-producing countries, primarily due to the industrial advancements in Germany, which was emerging as the European industrial leader at the time.
Step-by-step explanation:
The question asks which continent had more steel-producing countries in 1900. During the Second Industrial Revolution, European countries and the United States greatly expanded their industrial production. Although Britain had been a leader in the steel industry, by the end of the 19th century, Germany was the emerging European industrial leader and the United States had surpassed European production levels, as documented by the rise of steel production from one million tons in 1879 to ten million in 1900 and becoming the top steel producer by 1910. Therefore, in 1900, the continent with more steel-producing countries was Europe, as Germany and other European countries had also established significant steel industries.