Let it be tried whether any middle ground can be taken which will at once support a due supremacy of the national authority. what does it mean?

This means that let the suggestion/method be tried in order to come to a point of agreement that will be adopted to support and provide the expected superiority to the national authority.

Explanation:

The statement was made by James Madison to Edmund Randolph in 1787. Madison wanted a strong central government to provide order and stability. He wanted the "middle ground" that will help provide a due supremacy to the national authority. He was right to have supposed that it will not be well suited for the national government to oversee the entire task of a vast country.  

James Madison was an American statesman and Founding Father. He served as the fourth president of the United States from 1809 to 1817.  

a) hostility to or prejudice against jews.

b) the holocaust, also referred to as the shoah, was a genocide during world war ii in which nazi germany, aided by its collaborators, systematically murdered approximately 6 million european jews             , around two-thirds of the jewish population of europe, between 1941 and 1945.

for starters, there is the structural trend of rising primary government expenditure as a share of gdp, which reached 36% in 2014, up from 22% in 1991. this increase reflected a political desire to address the poverty and inequality that had gone unaddressed during previous decades. to support the increase, brazil’s government increased taxes on consumption and promoted progress toward labor-market formalization. nonetheless, public investment, particularly in infrastructure, took a hit. in fact, with the exception of the 2005-2008 period, total investment as a share of gdp has remained below 20% since 1991.