I think Nelson Mendela was the first president in Africa.
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<span>An ideal national security policy might balance the need for good relations with other countries against the need to take punitive or pre-emptive actions when necessary. This may prove difficult to achieve in reality because people of different nations may disagree on which policies are appropriate.</span>
<span>b. spice
</span><span> The product that was commonly traded along the Silk Road were spices. Spices were produced in countries far away from Europe and they were very expensive, both because the production was limited and because the trip to collect them was dangerous. The Silk Road linked Asia and Europe via land for many centuries before the age of Discoveries. </span>
Prior to the Great Depression the Roaring Twenties was a booming age because there was a boom in business and the excitement of popular fads. After World War I, America longed for what President Warren Harding called a “return to normalcy”. To Americans this meant the “good old days” before the war years. During the 1920’s, more Americans lived in cities than in rural areas and no longer were most people farmers. After the war business boomed and people worked in business and industry.President Calvin Coolidge declared the 1920, the “chief business of America is business”. During the Coolidge years business prospered and many Americans earned more money than ever before. Factories increased production to a growing demand for consumer goods such as washing machines , radios , and refrigerators. The largest boom was in the auto sales which gave rise to other industries. Cars needed steel, paint, tires and gasoline. New and better roads were built. Gas stations and restaurants appeared along the new roads. The housing industry began to boom as people moved out of the crowded cities and into the country or suburbs. New products such as cars changed the way of life for many Americans. They had freedom to visit other parts of the country. Radios and movies brought about other changes. New forms of entertainment were provided through radio programs and movies. The movies created new heroes and heroines. Hollywood grew into the movie capitol of the world. The 1920’s are sometimes labeled the jazz age because the new energetic kind of music reflected the spirit of the times. Jazz began among the black American musicians in New York and then swept the country and the world. Musicians such as Louis Armstrong won lasting fame for his contributions to jazz and helped fuel the Harlem Renaissance or rebirth of black culture.
____ Just prior to the Great Depression Herbert Clark Hoover became president of the United States’ He had earned his reputation as a business entrepreneur and an engineer.
Hoover wore several hats prior to becoming president of the United States. He was asked by the U.S. Counsel General in London to supervise the evacuation of thousands of American citizens trapped in Europe at the beginning of World War I. He became the chairman of the committee for Relief in Belgium with the mission of preventing famine in that nation. Within three years Hoover had raised and spent over one billion dollars for food relief in Europe.
____ When the United States entered World War I President Woodrow Wilson named Hoover U.S. Food Administrator and for the duration of the war he supervised the rationing and conservation of food supplies in the United States and the export of food to the U.S. and allied troops. After the War he became the general of European Relief and Rehabilitation efforts. In 1920 Hoover was an unsuccessful presidential candidate after which he was named Secretary of Commerce by then President Harding in 1921. He was considered the most honest and capable official in the administration. His department tried to improve the productivity of industry, promote international trade and the conservation of resources. In 1924 Hoover was the potential candidate for the vice presidency, however he did not get the nomination. In 1928 he won the nomination and the office of president.
1. Answer;
They evolved separately as they moved north and became two separate species.
Explanation;
The greenish warblers weren't geographically isolated, but they migrated around the Tibetan Plateau, evolving separately until they were no longer able to interbreed when both species (East and West) contacted in Siberia.
Greenish warblers were thought to have evolved from a single ancestral population that gradually diverged into two new species as it expanded northwards around the Tibetan plateau.
2. Answer;
- Their plumage patterns.
- Genetics and history
Explanation;
West Siberian greenish warblers (P. t. viridanus) and east Siberian greenish warblers (P. t. plumbeitarsus) differ subtly in their plumage patterns, most notably in their wing bars, which are used in communication. While viridanus has a single wing bar, plumbeitarsus has two. Around the southern side of the ring, plumage patterns change gradually.
Additionally, the two northern forms viridanus and plumbeitarsus are highly distinct genetically, but there is a gradient in genetic characteristics through the southern ring of populations. The greenish warblers were once confined to the southern portion of their range and then expanded northward along two pathways, evolving differences as they moved north. When the two expanding fronts met in central Siberia, they were different enough that they do not interbreed.
