Ask this question again, you're going to need a more specific time the president has done this. however, if you are asking about WWI, the USS Lusitania, the Zimmerman Telegram, German U Boats targeting American ships, and so on.
I'd go with C. Incas
Hope I Helped
Answer:the sun shined as bright as my teeth
Explanation:
The great task described in the gettysburg address was to rid the nation of slavery and unite america once agian
The previous route was very dangerous and was also expensive to traverse. Early travelers encountered dangers such as war zones and diseases. They also had to cross deserts and mountains to get to their destination. Progress was made when a new route via the sea was discovered. This limited the perils that were once faced.