Why The Republic of South Africa is registered as a company in the US

This, in response to a question asked by a SA citizen, why The Republic of South Africa, is registered as a company in the US. Follow the trail and open documents on the website to peruse information such as this, including what our national fiscus is estimated as being at present:

"Historically, from 1993 until 2012, the GDP growth rate averaged 3.3% reaching an all time high of 7.6% in December of 1994 and a record low of -6.3% in March of 2009. South Africa’s real gross domestic product (GDP) accelerated to 3.2% in the second quarter of 2012 from 2.7% in the first quarter, driven mainly by the primary sector, which includes agriculture and mining.

The 2012 MTBPS projects that South Africa’s GDP growth is expected to improve over the medium term. Real GDP growth is forecast to average 2.5% in 2012 and 3.0% in 2013, 3.8% in 2014 and rising to 4.1% in 2015.

Debt-service costs will continue to outpace the overall growth of expenditure. Following a reduction in November 2010, the SARB’s repurchase rate has subsequently remained at 5.5%. The lowering of the repurchase rate was necessitated by the fall in the inflation rate from 6.1% in September 2009 to 3.4% in October 2010.

The inflation rate in September was 5.5%, and is expected to average 5.3% in the last quarter of 2012, 5.2% in 2013, and 5.0% in 2014.

The current account deficit has widened sharply over the past year and is expected to average 5.9% of GDP in 2012, up from 3.3% in 2011.

The trade deficit detoriated to 1.9% of GDP in the first half of 2012 and net transfer payment nearly doubled as a share of GDP due to an increase in net customs revenue payments to the South African Customes Union.

Export volumes contracted at an annual rate of 6.3% in the second quarter of 2012 after falling by 1.5% in the first quarter of 2012."

EDGAR Search Results
http://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000932419&owner=exclude&count=40&hidefilings=0

The RSA is the only country listed as a corporation.

What are our rights and responsibilities in this corporation, as citizens of SA?