Lincoln ran on a political platform opposed to the expansion of slavery in the territories. His election served as the immediate impetus for the outbreak of the Civil War.
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Enemies because after WW2, jewish settlers came to an area called Palestine and forced the natives out from their homes and the nearby neighbors were all Arab speaking people and supported the Palestinians which caused a war between Israel and the Arabic states. So to answer your question yes Israel is surrounded by enemies.
The 15th amendment was passed on February 3, 1870 however African American couldn't vote until 1965
The multimedia presentation must have a proper graphical image that helps in bringing life to the presentation.
Also, it helps in emphasis on a single thing in a better manner as the image has more impact on the human brain than words.
However, make sure that the image is the optical center so that it can be seen clearly.