At what stage in u. s. trade history did protectionism reach its high point?

According to Carbaugh (2009), in US trade history protectionism reached its high point, in 1828 with the opening of Tariff of Abominations. “This measure amplified duties to an average level of 45 percent, the highest in the years prior to the Civil War, and triggered the South, which wanted low duties for its imported manufactured goods” (p. 183). Average tariff rate in 1890 under McKinley law was 48.4%.Tariffs were augmented extremely during Civil War as a means of paying for it.

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on