Nationals is what everyone looks forward to at the end of the season. It is the end of the year event that everyone tries to qualify for all season and train for. Nationals are one of the reasons for qualifiers, so that teams can qualify, other than at their regionals.
There are two different types of nationals: USA and AAU. The main difference is that you have to qualify to get into all the divisions except one at USA Nationals. In AAU, you don't have to qualify; you sign up for the division you think you should be in. Also, USA Nationals changes their location every year to a different city, and AAU Nationals is always in Orlando, Florida.
In USA Nationals, there are four different divisions: Open, National, American, and Patriot. You have to qualify for Open, National, and American, but not for Patriot. Patriot is the only one that you sign up for, so there are a lot of teams that want in on Patriot, just in case they don't qualify. They only take a certain amount, so in order to get a spot in that division, you have to sign up fairly early. Now, if you are signed up in Patriot early in the season, but you later qualify, then you can drop out of Patriot and join the division you qualified in.
There are multiple ways to qualify for nationals. One way is to get a bid through regionals. In Iowa, the first place team gets a National bid, and the second and third place teams get American bids. Another way is to win one at a qualifier. At qualifiers, you sign up for what division you want to play in and that is what bid you are fighting for. In different divisions the circumstances are different, for example; in the open division the top three teams get bids, but in the american division just the top team gets a bid. One last way to get a bid is a trickle down bid. This means that you placed just under a qualifying place at a tournament, but the team ahead of you either declined the bid or already has a different bid, so the bid then "trickles" down to you. For example: if you placed fourth at regionals, but the third place team already got a bid from a qualifier and they chose to keep that one, then they would decline the region's bid and it would go to you, the next one in line.
AAU Nationals, however, are different. There is no qualifying for them, you sign up, similar to the Patriot division. It is different though. There are four divisions: Open, Premier, Club, and Classic. The club will enter the tournament for a tournament fee and select a division based on their skill level and where they think they should be.
I have been to both nationals, and both are very competitive and are worth going to. Here is a link for more info about AAU Nationals:
http://aauvolleyball.org/Events/NationalChampionships/2016GirlsNationals.aspx
Here is a link for more info about USA Nationals:
http://www.teamusa.org/usa-volleyball/events/indoor/girls/2016-girls-jnc
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