|Rank|Lane|Name|Nationality|Time|Notes|
|---|---|---|---|---|---|
||5|Ryan Lochte|United States|1:53.94|WR|
||4|Aaron Peirsol|United States|1:54.33||
||8|Arkady Vyatchanin|Russia|1:54.93|EU|
|4|3|Markus Rogan|Austria|1:55.49|NR|
|5|6|Ryosuke Irie|Japan|1:55.72||
|6|1|Hayden Stoeckel|Australia|1:56.39|OC|
|7|2|Răzvan Florea|Romania|1:56.52||
|8|7|Gregor Tait|Great Britain|1:57.00||

Question: how many swimmers were from the us?
Answer: 2