Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Athlete | Nationality | 3.60 | 3.80 | 3.95 | Result |
| --- | --- | --- | --- | --- | --- |
| Bob Richards | United States | – | – | o | 4.55 OR |
| Don Laz | United States | – | – | o | 4.50 |
| Ragnar Lundberg | Sweden | – | – | o | 4.40 |
| Petro Denysenko | Soviet Union | – | – | o | 4.40 |
| Valto Olenius | Finland | – | – | – | 4.30 |
| Bunkichi Sawada | Japan | – | o | xxo | 4.20 |
| Volodymyr Brazhnyk | Soviet Union | – | o | o | 4.20 |
| Viktor Knyazev | Soviet Union | – | o | o | 4.20 |
| George Mattos | United States | – | – | o | 4.20 |
| Erkki Kataja | Finland | – | – | o | 4.10 |
| Tamás Homonnay | Sweden | – | o | o | 4.10 |
| Lennart Lind | Hungary | – | o | O | 4.10 |
| Milan Milakov | Yugoslavia | – | o | xo | 4.10 |
| Rigas Efstathiadis | Greece | – | o | o | 3.95 |
| Torfy Bryngeirsson | Iceland | – | o | o | 3.95 |
| Erling Kaas | Norway | – | o | xxx | 3.80 |
| Theodosios Balafas | Greece | o | o | xxx | 3.80 |
| Jukka Piironen | Finland | – | xo | xx | 3.80 |
| Zeno Dragomir | Romania | – | xo | xx | 3.80 |
Question:
What was the nationality of the athlete with a final result of 4.50?
Answer:
United States