How did the first Americans get to this continent? How do we know about these people?

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Explanation:

We see evidence of unique culture on the continent over 10,000 years ago, but exactly how these populations arrived on the continent, and from where, has been debated for decades. Scientists generally agree that the first Americans crossed over from Asia via the Bering land bridge, which connected the two continents.

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freedom of speech is also protected by the 1 amendment.

explanation:

here is pretty much what the 1st amendment says:

congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.