Miriam, the sister of Moses, passed away at the age of 126 on the 10th of Nissan of the year 2487 from creation (1274 BCE) -- 39 years after the Exodus and exactly one year before the Children of Israel entered the Holy Land. It is in deference to her passing that the "Great Shabbat" is commemorated on the Shabbat before Passover rather than the calendar date of the miracle's occurence, Nissan 10.
Link: About Miriam.
Three days after the two spies dispatched by Joshua scouted the city of Jericho (see entry for "Nissan 7" above), the children of Israel were ready to enter the land promised by G-d to their ancestors as their eternal heritage. As they approached the Jordan with the Holy Ark carried by the Kohanim (priests) in their lead, the river parted for them, as the waters of the Red Sea had split when their fathers and mothers marched out of Egypt 40 years earlier. (Joshua 4)
In today's "Nasi" reading (see "Nasi of the Day" in Nissan 1), we read of the gift bought by the nasi of the tribe of Dan, Achiezer ben Amishadai, for the inauguration of the Mishkan.
With the Exodus from Egypt, our nation was born. And so, we are a nation of hope and miracles.
Hope, not for some personal salvation in heaven, but a promise materialized here on earth, for all the earth, wrought by our muddy hands through the toil of our labors of body and soul.
That is why every mitzvah we do is a memory of that Exodus, that is why every prayer we utter concludes with that hope, for it is what breathes into this ephemeral life eternal meaning, that renders our wanderings in many lands a journey towards the grandest of destinies.