Awe and Unease as South Africa Stretches Out
South Africa shakes off decades of apartheid-era isolation and stretches beyond its borders in powerful explosion of trade and investment that fellow Africans are watching with awe and admiration, but also unease at prospect of ceding so much control to outsiders; development underscores metamorphosis since apartheid ended in 1994 as former pariah state seems poised to dominate continent that once shunned its products and leaders; economic expansion is accompanied by growing political influence; many people praise country's championing of new partnerships among African nations they hope will reduce economic dependency on former colonial rulers, but there are also cries of outrage from politicians and businessmen who view rapid expansion as new form of colonialism; map; charts; photo (L)