Mary Douglas Leakey was recognized in her lifetime as one of the world’s most distinguished fossil hunters. In 1974 Mary BEGINS work at Laetoli, 30 miles from Olduvai Gorge. It is here that Mary and her team found amazingly well preserved hominid footprints in volcanic beds, known as tuffs. The footprint tuff of 1976 has a potassium argon date of 3.5-3.8 mya, evidence of upright walking that supported Donald Johansen's find, Lucy, also known as Australopithecus Afarensis, though Mary Leakey has rejected this( she believe that the belong to the genus homo). Eighty feet of trail had been uncovered by 1979, leaving researchers to speculate that it was three hominids, possibly a family, that left their mark millions of years ago.
Answer:
the adoption of the secret ballot
Explanation:
Following the Presidential election of 1884, the adoption of the secret ballot came into effect in the 19th century in the United States starting with Massachusetts.
Before this adoption, the election period or finance is characterized by the financial muscle of the party and they influence how the voters tend to vote, through vote-buying, harassment of voters, and even direct assault.
However, with the adoption of the secret ballots, their party-centered elections got reduced as the states become responsible for providing the ballot for the voters rather than the voters themselves or the party.
Alfred Thayer Mahan was a United States naval officer, historian, and one of the most influential American authors of the nineteenth century.
He argued that modern navies needed repair and coaling stations, which would not be dependable if controlled by other nations. This reasoning implied a justification for American acquisition of colonies to develop port facilities throughout the world.
