<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This schedule contains Summary Financial Information extracted from the Form
N-SAR and the financial statements and is qualified in its entirety by
references to such documents.
</LEGEND>
<SERIES>
   <NUMBER> 022
   <NAME> NUVEEN CALIFORNIA INSURED MUNICIPAL BOND FUND - CLASS B
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          FEB-29-2000
<PERIOD-START>                             MAR-01-1999
<PERIOD-END>                               FEB-29-2000
<INVESTMENTS-AT-COST>                           239859
<INVESTMENTS-AT-VALUE>                          242663
<RECEIVABLES>                                    24752
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  267415
<PAYABLE-FOR-SECURITIES>                         36433
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         2690
<TOTAL-LIABILITIES>                              39123
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        227507
<SHARES-COMMON-STOCK>                             1069
<SHARES-COMMON-PRIOR>                              795
<ACCUMULATED-NII-CURRENT>                          190
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (2209)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          2804
<NET-ASSETS>                                    228292
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                14118
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    1880
<NET-INVESTMENT-INCOME>                          12238
<REALIZED-GAINS-CURRENT>                        (2150)
<APPREC-INCREASE-CURRENT>                      (18495)
<NET-CHANGE-FROM-OPS>                           (8407)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          455
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            487
<NUMBER-OF-SHARES-REDEEMED>                        229
<SHARES-REINVESTED>                                 17
<NET-CHANGE-IN-ASSETS>                         (20255)
<ACCUMULATED-NII-PRIOR>                             34
<ACCUMULATED-GAINS-PRIOR>                         (58)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             1304
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   1900
<AVERAGE-NET-ASSETS>                             10843
<PER-SHARE-NAV-BEGIN>                            11.11
<PER-SHARE-NII>                                    .45
<PER-SHARE-GAIN-APPREC>                          (.92)
<PER-SHARE-DIVIDEND>                             (.44)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.20
<EXPENSE-RATIO>                                   1.63


</TABLE>